Two PCs work with forwarded ports, new one does not

[2Buck]

Hi, I don't know if I'm asking this in the right place. I also don't really know much about any of this…

So, I built a PFSense router about 3 years ago and all has been well. Well, I've had some trouble here and there but I usually figure it our fairly quickly. This problem has been a little more troublesome.

So here's my problem. I have my main PC and another PC I use to host basic game servers both port forwarded and they work fine. I just slapped together a new machine out of spare parts to use as another game server. So I set up its static IP and added its IP to my IPs alias (same one I use with the other two PCs) and that didn't work. So I tried to make a new rule based off of my main machine's rule that works, just changing the IP. This didn't work either. Basically I copied everything my main PC uses, but changed the IP for the new server's static IP.

Anyone know what's going on? I'm really rusty with this stuff and I never knew much at all about it to begin with. I'm sorry if left out any information, just let me know and I'll fill in the blanks.

Thank you so much to anyone who can help me out!